﻿#region File Description
//-----------------------------------------------------------------------------
// Wave.cs
//
// Attack of the Crazy Pixels
// Copyright (c) 2009 VosSoft
//-----------------------------------------------------------------------------
#endregion
#region License
//-----------------------------------------------------------------------------
// The MIT License (MIT)
//
// Copyright (c) 2009 VosSoft
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//-----------------------------------------------------------------------------
#endregion

#region Using Statements
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;
using Microsoft.Xna.Framework.Net;
using Microsoft.Xna.Framework.Storage;
#endregion

namespace Attack_of_the_Crazy_Pixels
{
    /// <summary>
    /// Defines a Wave of Enemies.
    /// </summary>
    public class Wave
    {
        const int enemiesPerWave = 10;
        const float enemySpawnTime = 2.0f;

        Level level;
        int wave;

        int enemiesThisWave = 0;
        float timeSinceLastEnemySpawn = enemySpawnTime;
        float enemyHitpoints;

        /// <summary>
        /// Creates a new Wave.
        /// </summary>
        /// <param name="enemyHitpoints">The hitpoints all Enemies in this Wave will have.</param>
        /// <param name="wave">Number of the Wave.</param>
        /// <param name="level">Backreference to the Level.</param>
        public Wave(float enemyHitpoints, int wave, Level level)
        {
            this.enemyHitpoints = enemyHitpoints;
            this.wave = wave;
            this.level = level;
        }

        /// <summary>
        /// Updates the Wave and spawns new Enemies.
        /// </summary>
        /// <param name="elapsedTime">Time since the last frame (in seconds).</param>
        public void Update(float elapsedTime)
        {
            if (enemiesThisWave < enemiesPerWave)
            {
                timeSinceLastEnemySpawn += elapsedTime;
                if (timeSinceLastEnemySpawn >= enemySpawnTime)
                {
                    level.Enemies.Add(new Enemy(50.0f, enemyHitpoints, Color.Red, (int)enemyHitpoints * wave, level));
                    enemiesThisWave++;
                    timeSinceLastEnemySpawn -= enemySpawnTime;
                }
            }
            else
            {
                level.Waves.Remove(this);
            }
        }
    }
}
